Letter from Peter Brian Medawar, on a paper 'The disappearance of the X zone of the mouse adrenal cortex during first pregnancy' by I C Jones, to D C Martin, assistant secretary of the Royal Society Paper reference code: B52 Medawar has read this paper and finds himself 'unqualified' to give an opinion on 'this very specialised and notoriously tricky field of research'. Suggests the paper go to Professor Zuckerman, Dr Parkes, with Dr Folley as a third possibility. Written at University College London, Department of Zoology, Gower Street [England]. [Published in Proceedings B, 1952]. Endorsed on recto as received 4 October 1951. 2 October 1951